Podcast
Questions and Answers
What type of echinoderm has flexible arms that are easily broken to escape predators?
What type of echinoderm has flexible arms that are easily broken to escape predators?
- Sand dollar
- Sea star
- Brittle stars (correct)
- Sea urchin
Sea stars belong to what phylum?
Sea stars belong to what phylum?
Echinodermata
How do most starfish get their food?
How do most starfish get their food?
Predation of small animals
Which echinoderm is grouped with a sea urchin?
Which echinoderm is grouped with a sea urchin?
An echinoderm that has a large number of spines attached to it is probably a:
An echinoderm that has a large number of spines attached to it is probably a:
Ring canals and radial canals are both part of the ____ system.
Ring canals and radial canals are both part of the ____ system.
The process of regrowing body parts is called:
The process of regrowing body parts is called:
What type of symmetry does a brittle star have?
What type of symmetry does a brittle star have?
Where is the anus of a starfish located?
Where is the anus of a starfish located?
A 'keystone' species is often a(n):
A 'keystone' species is often a(n):
Sea otters share their habitat with what other important organisms?
Sea otters share their habitat with what other important organisms?
If you remove the starfish from a shoreline area, what happens to the mussel populations?
If you remove the starfish from a shoreline area, what happens to the mussel populations?
The word 'echinoderm' means:
The word 'echinoderm' means:
What phylum of invertebrates do starfish, sand dollars, and sea urchins all belong to?
What phylum of invertebrates do starfish, sand dollars, and sea urchins all belong to?
Echinoderms all live in _______ and are _______ or __________.
Echinoderms all live in _______ and are _______ or __________.
__________ underside has a mouth and their arms are used to pry open shelled prey such as mollusks.
__________ underside has a mouth and their arms are used to pry open shelled prey such as mollusks.
Echinoderms can _______ lost arms.
Echinoderms can _______ lost arms.
Echinoderms are ______ symmetrical.
Echinoderms are ______ symmetrical.
Where are echinoderms found?
Where are echinoderms found?
Starfish can move using specialized structures called ____ _____
Starfish can move using specialized structures called ____ _____
On a starfish, each arm has _______ of tube feet that help them navigate over rocks and sand.
On a starfish, each arm has _______ of tube feet that help them navigate over rocks and sand.
The movement and circulation of a sea star is accomplished by canals within the animal that fill with water, a system called the _________ ________ system.
The movement and circulation of a sea star is accomplished by canals within the animal that fill with water, a system called the _________ ________ system.
Echinoderms have a ______ ______ that surrounds the mouth and helps to coordinate their movements and responses.
Echinoderms have a ______ ______ that surrounds the mouth and helps to coordinate their movements and responses.
Do echinoderms have a highly developed nervous system?
Do echinoderms have a highly developed nervous system?
Echinoderms have ________ ______ on their arms that gather information about their surroundings, such as light and temperature to help the organism respond to its environment.
Echinoderms have ________ ______ on their arms that gather information about their surroundings, such as light and temperature to help the organism respond to its environment.
What is a keystone species?
What is a keystone species?
A starfish is also known as a:
A starfish is also known as a:
Sea urchins and sand dollars are grouped together because they have ______ solid plates that form around their soft bodies.
Sea urchins and sand dollars are grouped together because they have ______ solid plates that form around their soft bodies.
_____ __________ have hundreds of spines sticking off their bodies, which can serve as a defense against predators.
_____ __________ have hundreds of spines sticking off their bodies, which can serve as a defense against predators.
_____ ________ tend to be flat and will spend most of their time submerged under the sand in shallow waters.
_____ ________ tend to be flat and will spend most of their time submerged under the sand in shallow waters.
_______ ______ have very long flexible arms that can break off (and regenerate later).
_______ ______ have very long flexible arms that can break off (and regenerate later).
_____ ________ usually feed on dead or decaying organic matter on the ocean floor.
_____ ________ usually feed on dead or decaying organic matter on the ocean floor.
The _____ canal extends from the ring canal and into the starfish's arms.
The _____ canal extends from the ring canal and into the starfish's arms.
Starfish: large and centrally located between the mouth and anus is the _______, where food is digested.
Starfish: large and centrally located between the mouth and anus is the _______, where food is digested.
_________ __________ are located within the arms of the starfish, chemicals help break down food.
_________ __________ are located within the arms of the starfish, chemicals help break down food.
In a starfish, how many arms extend from the central disk?
In a starfish, how many arms extend from the central disk?
The sea star, or starfish, is a _______ invertebrate belonging to the phylum Echinodermata.
The sea star, or starfish, is a _______ invertebrate belonging to the phylum Echinodermata.
Study Notes
Echinoderms Overview
- Echinoderms are marine invertebrates belonging to the phylum Echinodermata.
- They exhibit radial symmetry, lack a brain, and possess an endoskeleton.
Types of Echinoderms
- Brittle Stars: Have flexible arms that can easily break to evade predators.
- Sea Stars (Starfish): Known for their predatory nature, feeding primarily on small animals.
- Sea Urchins: Characterized by numerous spines for protection.
- Sand Dollars: Flat echinoderms that dwell beneath shallow waters.
- Sea Cucumbers: Typically feed on decaying organic matter on the ocean floor.
Anatomy and Physiology
- Echinoderms possess a water vascular system comprised of ring canals and radial canals for movement and circulation using tube feet.
- Radial canals extend into the arms of sea stars.
- The digestive system includes a central stomach for food digestion and digestive glands within the arms to aid breakdown.
- The anus is located on the top side of a starfish.
Reproduction and Regeneration
- Echinoderms can regenerate lost arms, a crucial adaptation for survival.
- The process of regrowth is referred to as regeneration.
Keystone Species and Ecological Role
- Sea stars are considered keystone species; their removal can lead to a dominance of certain species, disrupting biodiversity.
- Sea otters, a keystone predator, share habitats with kelp and sea urchins.
Sensory and Nervous System
- Echinoderms have a nerve ring that coordinates movement and responses, but they do not possess a highly developed nervous system.
- Sensory cells located on their arms gather environmental information, such as light and temperature.
Habitat and Distribution
- Echinoderms are exclusively found in ocean habitats, primarily in shallow waters near shorelines.
- They are generally classified as predators or scavengers within their ecosystems.
Unique Characteristics
- Echinodermata translates to "spiny skin," reflecting their tough exterior.
- Their movement and navigation are facilitated by hundreds of tube feet on their arms.
Group Characteristics
- Sea urchins and sand dollars share solid plate structures surrounding their bodies for additional protection.
- Brittle stars have long, flexible arms that can regenerate after breaking.
General Terminology
- A "keystone" species plays a critical role in maintaining ecological balance.
- Marine Invertebrate: Refers to aquatic organisms without backbones, such as starfish and sea cucumbers.
Fun Fact
- Adult sea stars usually exhibit five arms radiating from a central disk, showcasing their distinct morphology.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge with these flashcards on starfish and other echinoderms. Learn about their characteristics, feeding habits, and classifications. This quiz is perfect for biology students interested in marine life.
